I am posting each of my suggestions separately. I realise that makes a large number of posts, but it ensures that no suggestion gets lost if there are a lot of comments.
Suggestion 9: I find I have a lot of low grade gems (e.g. garnets, silver debris, pearls) that I have no use for, and the number just increases each day. Some method should be found to reduce their number (selling them in 100 lots for 2 or 3 coins springs to mind.) Perhaps a large number of gems could buy flags for alliance points. See also suggestion 10.